To interpret the algebraic expression \( 2.5x + 10 \):
- The term \( 10 \) represents the entry fee for the car.
- The term \( 2.5x \) represents the individual entry fees for Julio and Ashley, where \( x \) is the number of individuals (in this case, \( x = 2 \) for Julio and Ashley).
Given this, the correct interpretation of a part of the expression is:
The entry fee for the car was $10.00.
Therefore, this is the accurate interpretation.